Inquiry Now

DNV Grade DH36 Shipbuilding Steel Plate - NV D36 High-Strength Marine Structural Steel

info@yx-steel.com 8615837212056 Get a Quote

DNV Grade DH36 shipbuilding steel plates are high-strength structural steel plates certified by DNV (Det Norske Veritas) for shipbuilding applications. They offer excellent low-temperature toughness, tensile strength, weldability, and resistance to saltwater corrosion, and are widely used in the global shipbuilding and offshore engineering sectors. Our company supplies DNV Grade DH36 shipbuilding steel plates in a full range of specifications, including hot-rolled, TMCP, and normalized conditions. All products have undergone rigorous inspection and certification by DNV, meet the highest international standards for offshore engineering, and are suitable for medium- to large-sized ocean-going vessel hulls, offshore platforms, and coastal engineering structures.

Certification :
DNV Rules
Grade :
DNV Grade DH36 (NV D36)
Thickness :
5.0 - 150.0 mm
Width :
1500.0 - 4000.0 mm
Length :
6000.0 - 18000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

1. What is DNV Grade DH36 shipbuilding steel plate?

DNV Grade DH36 is a high-strength, low-alloy shipbuilding structural steel plate certified by Det Norske Veritas (DNV). It features stable mechanical properties, excellent weldability and corrosion resistance, as well as outstanding low-temperature impact toughness.

This steel plate undergoes rigorous smelting, controlled rolling, and non-destructive testing, resulting in a dense and uniform microstructure, low impurity content, high dimensional accuracy, and excellent structural stability. It effectively withstands harsh operating conditions such as extreme temperature fluctuations, the impact of ocean waves, long-term seawater corrosion, and high stress loads, ensuring the safety and service life of critical structures in ocean-going and coastal vessels, offshore platforms, and other marine engineering equipment. It is one of the core materials used in high-end marine engineering equipment.

2. Meaning of the Designation

DNV: Certified by Det Norske Veritas (DNV)

D: Stands for “Quality Grade,” indicating that the steel has passed an impact test at -20°C

H: Stands for “High Strength”

36: Stands for “Strength Grade,” indicating that the minimum yield strength of the steel is 315 MPa (≈ 32 kgf/mm²)

Available Specifications and Dimensions

Product	DNV Grade DH36 Shipbuilding Steel Plate
Certification	DNV
Grade	DH36
Material Category	Heigh-Strength Structural Steel for Ship and Ocean Engineering
Thickness	5 - 150 mm
Width	1500 - 4000 mm
Length	6000 - 18000 mm
Delivery Conditions	Hot Rolled (HR), Controlled Rolled (CR), Normalized (N), Thermo-Mechanical Controlled Processed (TMCP), Quenched and Tempered (Q+T).
Surface Conditions	The surface is in its original condition; surface treatments such as sandblasting, rust removal, oiling and painting are available.
Testing	Tensile test, Charpy V-notch impact test, Ultrasonic testing (UT), Z-direction property test (Grades Z15/Z25/Z35), Dimensional inspection.
Applications	It is primarily used in critical load-bearing hull structures of deep-sea cargo ships, oil tankers, and container ships operating in cold waters, as well as in high-load, low-temperature marine engineering load-bearing components such as offshore platforms in cold regions, offshore wind turbine foundations, and polar maritime equipment.
MOQ	5 tons (small orders can be negotiated).
Delivery Time	15 - 20 days after order confirmation (urgent orders accepted).
Packaging	Standard export packaging for sea transport, or as required.
Country of Origin	China

Chemical Composition

Chemical Composition (Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Nb	V	Ti	Mo	Als
NV D36	≤ 0.18	≤ 0.50	0.90 - 1.60	≤ 0.025	≤ 0.025	≤ 0.35	≤ 0.20	≤ 0.40	0.02 - 0.05	0.05 - 0.10	≤ 0.02	≤ 0.08	≥ 0.015

Carbon Equivalent (wt %)

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.38	≤ 0.40

Calculation formula (IIW): CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

Mechanical Properties

Tensile Test

Grade	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
NV D36	≥ 355	490 - 630	≥ 21

Charpy (V-notch) Impact Test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
NV D36	≤ 50	- 20	≥ 34	≥ 24
	> 50 - 70	- 20	≥ 41	≥ 27
	> 70 - 150	- 20	≥ 50	≥ 34

Applications

I. Construction of Ocean-Going Civilian Vessels (Core and Primary Applications)

1. Large Dry Cargo Ships

Suitable for ultra-large container ships, Cape-size bulk carriers, VLCC/ULCC oil tankers, etc.

Application areas: High-strength decks, bottom plates, outer side plating, stem posts, cargo hold longitudinal bulkheads, ribs, longitudinal frames, and other primary load-bearing structures.

2. Roll-on/Roll-off (Ro-Ro) Ships, Refrigerated Carriers, and Ocean-Going Fishing Vessels

Application Areas: Deck load-bearing zones, watertight bulkheads, and side wave-resistant structures.

3. Special-Purpose Vessels for Cold Regions/Polar Areas

Conventional ocean-going vessels operating on routes in the North Atlantic, North Sea, and winter North Pacific

Application Areas: Critical load-bearing areas throughout the hull.

Polar auxiliary icebreakers, polar cruise ships, and polar research vessels

Application Areas: Hull plating, ice-zone stiffeners, and icebreaking bow support structures.

LNG carriers

Application Areas: Support frames for secondary shielding layers in cargo holds and deck bases in cryogenic zones.

4. Marine Engineering Vessels

Tugs, offshore supply vessels, dredgers, salvage and rescue vessels, etc.

Application Areas: Deck crane bases, hull outer shells, load-bearing bases for operational equipment.

II. Offshore Oil and Gas Engineering Equipment (Designed for Harsh Deep-Sea Environments)

1. Fixed Offshore Drilling Rigs

Application Areas: Jack-up legs, main support trusses, top decks, thick plates at joint connections, and water-barrier casing support structures.

2. Floating Offshore Equipment

FPSOs (Floating Production, Storage, and Offloading units), semi-submersible drilling platform floats, offshore floating production and storage vessels, etc.

3. Subsea Pipeline Support Systems

Application Areas: Subsea oil and gas pipeline supports, riser clamps, subsea manifold bases, pipeline protection structures, etc.

III. Offshore New Energy Projects

1. Offshore Wind Power in Northern Waters and Offshore Deepwater Areas:

Application Areas: Monopile foundations, transition sections, support structures for the lower sections of tower cylinders in low-temperature sea-level zones, and decks and columns of offshore step-up substations.

2. Tidal and Tidal Current Power Stations:

Application Areas: Subsea foundations, load-bearing hulls of floating power generation platforms.

IV. Port and Coastal Hydraulic Infrastructure

1. Cold-region port barges, floating docks, dry dock gates, fender structures for large berths, and bases for heavy-duty port gantry cranes;

2. Offshore anchorages for cross-sea bridges, pier jetties for nearshore wind farms, and hydraulic steel structures for intake and outflow systems at coastal power plants;

3. Shipyard slipways, hull assembly jigs, and load-bearing structures for ship repair platforms.

V. Military and Specialized Maritime Structures

Offshore patrol vessels, auxiliary military supply ships, etc.

Application Areas: Secondary load-bearing structures of the hull, and bases for deck equipment.

Other Information

Core Product Advantages

1. Authoritative DNV Certification

The entire product line is certified by Det Norske Veritas (DNV), comes with complete Material Test Certificates (MTCs), and supports on-site inspections by third-party testing agencies, meeting the compliance and acceptance requirements for global projects.

2. Excellent Low-Temperature Toughness

Maintains good impact toughness in low-temperature marine environments, effectively reducing the risk of brittle fracture in structures and ensuring operational safety under extreme weather conditions.

3. Stable Internal Structure

The steel plates feature a uniform internal microstructure, free of metallurgical defects such as inclusions and cracks, meeting the long-term durability design requirements for offshore engineering.

4. Excellent Seawater Corrosion Resistance

Through optimized alloy composition, resistance to salt spray and seawater corrosion is enhanced, slowing the material aging process and extending the service life of offshore structures.

5. Excellent Weldability and Machinability

Designed with a low carbon equivalent, the steel is compatible with conventional welding processes and offers good bending, cutting, and forming capabilities, making it suitable for complex structural fabrication and efficient on-site construction.

6. Customizable Specifications

Custom sizing and deep processing services are available to meet diverse engineering needs.

FAQ

Q1:

Does your DNV Grade DH36 shipbuilding steel plate support third-party inspection?

Yes. All of our DNV Grade DH36 shipbuilding steel plates are subject to inspection by third-party organizations such as SGS and BV, and we provide complete official DNV certification documents with each shipment.

Q2:

What are the primary applications of DNV Grade DH36 shipbuilding steel plates?

DNV Grade DH36 steel plates are widely used in the hull structures of large ocean-going vessels, offshore oil platforms, port facilities, and coastal marine engineering projects. They are particularly suitable for critical load-bearing and fatigue-resistant components in harsh marine environments.

Q3:

What processing and customization services do you offer?

We offer value-added services such as cutting, polishing, surface rust removal, and heat treatment. We can also customize steel plates to special specifications based on customers’ project drawings to meet their specific engineering needs.

Q4:

What are the differences between NV A36, NV D36, and NV E36 shipbuilding steel plates?

The key differences between these three types of shipbuilding steel plates lie in their low-temperature impact toughness and applications:

Grade	Yield Strength	Tensile Strength	Impact Test Temperature	Applications
NV A36	≥ 355 MPa	490–630 MPa	0°C	Coastal vessels, decks, superstructures, mild-temperature waters
NV D36	≥ 355 MPa	490–630 MPa	-20°C	Vessels in cold regions, hull bottoms, bulkheads
NV E36	≥ 355 MPa	490–630 MPa	-40°C	Arctic vessels, offshore platforms, low-temperature marine structures

Note: Do not substitute grades arbitrarily; adhere to DNV design temperature requirements.

Q5:

What is the difference between DNV Grade AH36 and DNV Grade DH36 shipbuilding steel plates?

Both are high-strength structural steel plates for shipbuilding with a yield strength of at least 355 MPa, in compliance with DNV regulations. The key difference lies in the minimum service temperature:

AH36: Design operating temperature ≥ 0°C, impact test temperature 0°C; suitable for warm waters.

DH36: Offers superior low-temperature toughness, with an impact test temperature of -20°C, and is suitable for cold waters.